package rec;

/**
 * 一、 递归
 * 2. 合并两个有序链表
 * 2024-11-4
 */


class demo2 {
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) {
        //递归出口
        if(l1 == null) return l2;
        if(l2 == null) return l1;

        if(l1.val <= l2.val){
            l1.next = mergeTwoLists(l1.next, l2);
            return l1;
        }else {
            l2.next = mergeTwoLists(l2.next, l1);
            return l2;
        }
    }
}









